/*
 * Copyright (c) 1995, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
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 *
 *
 *
 *
 *
 *
 *
 */
package java.awt;

import java.awt.event.*;
import java.io.*;

/**
 * <b>NOTE:</b> The <code>Event</code> class is obsolete and is
 * available only for backwards compatibility.  It has been replaced
 * by the <code>AWTEvent</code> class and its subclasses.
 * <p>
 * <code>Event</code> is a platform-independent class that
 * encapsulates events from the platform's Graphical User
 * Interface in the Java&nbsp;1.0 event model. In Java&nbsp;1.1
 * and later versions, the <code>Event</code> class is maintained
 * only for backwards compatibility. The information in this
 * class description is provided to assist programmers in
 * converting Java&nbsp;1.0 programs to the new event model.
 * <p>
 * In the Java&nbsp;1.0 event model, an event contains an
 * {@link Event#id} field
 * that indicates what type of event it is and which other
 * <code>Event</code> variables are relevant for the event.
 * <p>
 * For keyboard events, {@link Event#key}
 * contains a value indicating which key was activated, and
 * {@link Event#modifiers} contains the
 * modifiers for that event.  For the KEY_PRESS and KEY_RELEASE
 * event ids, the value of <code>key</code> is the unicode
 * character code for the key. For KEY_ACTION and
 * KEY_ACTION_RELEASE, the value of <code>key</code> is
 * one of the defined action-key identifiers in the
 * <code>Event</code> class (<code>PGUP</code>,
 * <code>PGDN</code>, <code>F1</code>, <code>F2</code>, etc).
 *
 * @author Sami Shaio
 * @since JDK1.0
 */
public class Event implements java.io.Serializable {

  private transient long data;

    /* Modifier constants */

  /**
   * This flag indicates that the Shift key was down when the event
   * occurred.
   */
  public static final int SHIFT_MASK = 1 << 0;

  /**
   * This flag indicates that the Control key was down when the event
   * occurred.
   */
  public static final int CTRL_MASK = 1 << 1;

  /**
   * This flag indicates that the Meta key was down when the event
   * occurred. For mouse events, this flag indicates that the right
   * button was pressed or released.
   */
  public static final int META_MASK = 1 << 2;

  /**
   * This flag indicates that the Alt key was down when
   * the event occurred. For mouse events, this flag indicates that the
   * middle mouse button was pressed or released.
   */
  public static final int ALT_MASK = 1 << 3;

    /* Action keys */

  /**
   * The Home key, a non-ASCII action key.
   */
  public static final int HOME = 1000;

  /**
   * The End key, a non-ASCII action key.
   */
  public static final int END = 1001;

  /**
   * The Page Up key, a non-ASCII action key.
   */
  public static final int PGUP = 1002;

  /**
   * The Page Down key, a non-ASCII action key.
   */
  public static final int PGDN = 1003;

  /**
   * The Up Arrow key, a non-ASCII action key.
   */
  public static final int UP = 1004;

  /**
   * The Down Arrow key, a non-ASCII action key.
   */
  public static final int DOWN = 1005;

  /**
   * The Left Arrow key, a non-ASCII action key.
   */
  public static final int LEFT = 1006;

  /**
   * The Right Arrow key, a non-ASCII action key.
   */
  public static final int RIGHT = 1007;

  /**
   * The F1 function key, a non-ASCII action key.
   */
  public static final int F1 = 1008;

  /**
   * The F2 function key, a non-ASCII action key.
   */
  public static final int F2 = 1009;

  /**
   * The F3 function key, a non-ASCII action key.
   */
  public static final int F3 = 1010;

  /**
   * The F4 function key, a non-ASCII action key.
   */
  public static final int F4 = 1011;

  /**
   * The F5 function key, a non-ASCII action key.
   */
  public static final int F5 = 1012;

  /**
   * The F6 function key, a non-ASCII action key.
   */
  public static final int F6 = 1013;

  /**
   * The F7 function key, a non-ASCII action key.
   */
  public static final int F7 = 1014;

  /**
   * The F8 function key, a non-ASCII action key.
   */
  public static final int F8 = 1015;

  /**
   * The F9 function key, a non-ASCII action key.
   */
  public static final int F9 = 1016;

  /**
   * The F10 function key, a non-ASCII action key.
   */
  public static final int F10 = 1017;

  /**
   * The F11 function key, a non-ASCII action key.
   */
  public static final int F11 = 1018;

  /**
   * The F12 function key, a non-ASCII action key.
   */
  public static final int F12 = 1019;

  /**
   * The Print Screen key, a non-ASCII action key.
   */
  public static final int PRINT_SCREEN = 1020;

  /**
   * The Scroll Lock key, a non-ASCII action key.
   */
  public static final int SCROLL_LOCK = 1021;

  /**
   * The Caps Lock key, a non-ASCII action key.
   */
  public static final int CAPS_LOCK = 1022;

  /**
   * The Num Lock key, a non-ASCII action key.
   */
  public static final int NUM_LOCK = 1023;

  /**
   * The Pause key, a non-ASCII action key.
   */
  public static final int PAUSE = 1024;

  /**
   * The Insert key, a non-ASCII action key.
   */
  public static final int INSERT = 1025;

    /* Non-action keys */

  /**
   * The Enter key.
   */
  public static final int ENTER = '\n';

  /**
   * The BackSpace key.
   */
  public static final int BACK_SPACE = '\b';

  /**
   * The Tab key.
   */
  public static final int TAB = '\t';

  /**
   * The Escape key.
   */
  public static final int ESCAPE = 27;

  /**
   * The Delete key.
   */
  public static final int DELETE = 127;


  /* Base for all window events. */
  private static final int WINDOW_EVENT = 200;

  /**
   * The user has asked the window manager to kill the window.
   */
  public static final int WINDOW_DESTROY = 1 + WINDOW_EVENT;

  /**
   * The user has asked the window manager to expose the window.
   */
  public static final int WINDOW_EXPOSE = 2 + WINDOW_EVENT;

  /**
   * The user has asked the window manager to iconify the window.
   */
  public static final int WINDOW_ICONIFY = 3 + WINDOW_EVENT;

  /**
   * The user has asked the window manager to de-iconify the window.
   */
  public static final int WINDOW_DEICONIFY = 4 + WINDOW_EVENT;

  /**
   * The user has asked the window manager to move the window.
   */
  public static final int WINDOW_MOVED = 5 + WINDOW_EVENT;

  /* Base for all keyboard events. */
  private static final int KEY_EVENT = 400;

  /**
   * The user has pressed a normal key.
   */
  public static final int KEY_PRESS = 1 + KEY_EVENT;

  /**
   * The user has released a normal key.
   */
  public static final int KEY_RELEASE = 2 + KEY_EVENT;

  /**
   * The user has pressed a non-ASCII <em>action</em> key.
   * The <code>key</code> field contains a value that indicates
   * that the event occurred on one of the action keys, which
   * comprise the 12 function keys, the arrow (cursor) keys,
   * Page Up, Page Down, Home, End, Print Screen, Scroll Lock,
   * Caps Lock, Num Lock, Pause, and Insert.
   */
  public static final int KEY_ACTION = 3 + KEY_EVENT;

  /**
   * The user has released a non-ASCII <em>action</em> key.
   * The <code>key</code> field contains a value that indicates
   * that the event occurred on one of the action keys, which
   * comprise the 12 function keys, the arrow (cursor) keys,
   * Page Up, Page Down, Home, End, Print Screen, Scroll Lock,
   * Caps Lock, Num Lock, Pause, and Insert.
   */
  public static final int KEY_ACTION_RELEASE = 4 + KEY_EVENT;

  /* Base for all mouse events. */
  private static final int MOUSE_EVENT = 500;

  /**
   * The user has pressed the mouse button. The <code>ALT_MASK</code>
   * flag indicates that the middle button has been pressed.
   * The <code>META_MASK</code>flag indicates that the
   * right button has been pressed.
   *
   * @see java.awt.Event#ALT_MASK
   * @see java.awt.Event#META_MASK
   */
  public static final int MOUSE_DOWN = 1 + MOUSE_EVENT;

  /**
   * The user has released the mouse button. The <code>ALT_MASK</code>
   * flag indicates that the middle button has been released.
   * The <code>META_MASK</code>flag indicates that the
   * right button has been released.
   *
   * @see java.awt.Event#ALT_MASK
   * @see java.awt.Event#META_MASK
   */
  public static final int MOUSE_UP = 2 + MOUSE_EVENT;

  /**
   * The mouse has moved with no button pressed.
   */
  public static final int MOUSE_MOVE = 3 + MOUSE_EVENT;

  /**
   * The mouse has entered a component.
   */
  public static final int MOUSE_ENTER = 4 + MOUSE_EVENT;

  /**
   * The mouse has exited a component.
   */
  public static final int MOUSE_EXIT = 5 + MOUSE_EVENT;

  /**
   * The user has moved the mouse with a button pressed. The
   * <code>ALT_MASK</code> flag indicates that the middle
   * button is being pressed. The <code>META_MASK</code> flag indicates
   * that the right button is being pressed.
   *
   * @see java.awt.Event#ALT_MASK
   * @see java.awt.Event#META_MASK
   */
  public static final int MOUSE_DRAG = 6 + MOUSE_EVENT;


  /* Scrolling events */
  private static final int SCROLL_EVENT = 600;

  /**
   * The user has activated the <em>line up</em>
   * area of a scroll bar.
   */
  public static final int SCROLL_LINE_UP = 1 + SCROLL_EVENT;

  /**
   * The user has activated the <em>line down</em>
   * area of a scroll bar.
   */
  public static final int SCROLL_LINE_DOWN = 2 + SCROLL_EVENT;

  /**
   * The user has activated the <em>page up</em>
   * area of a scroll bar.
   */
  public static final int SCROLL_PAGE_UP = 3 + SCROLL_EVENT;

  /**
   * The user has activated the <em>page down</em>
   * area of a scroll bar.
   */
  public static final int SCROLL_PAGE_DOWN = 4 + SCROLL_EVENT;

  /**
   * The user has moved the bubble (thumb) in a scroll bar,
   * moving to an "absolute" position, rather than to
   * an offset from the last position.
   */
  public static final int SCROLL_ABSOLUTE = 5 + SCROLL_EVENT;

  /**
   * The scroll begin event.
   */
  public static final int SCROLL_BEGIN = 6 + SCROLL_EVENT;

  /**
   * The scroll end event.
   */
  public static final int SCROLL_END = 7 + SCROLL_EVENT;

  /* List Events */
  private static final int LIST_EVENT = 700;

  /**
   * An item in a list has been selected.
   */
  public static final int LIST_SELECT = 1 + LIST_EVENT;

  /**
   * An item in a list has been deselected.
   */
  public static final int LIST_DESELECT = 2 + LIST_EVENT;

  /* Misc Event */
  private static final int MISC_EVENT = 1000;

  /**
   * This event indicates that the user wants some action to occur.
   */
  public static final int ACTION_EVENT = 1 + MISC_EVENT;

  /**
   * A file loading event.
   */
  public static final int LOAD_FILE = 2 + MISC_EVENT;

  /**
   * A file saving event.
   */
  public static final int SAVE_FILE = 3 + MISC_EVENT;

  /**
   * A component gained the focus.
   */
  public static final int GOT_FOCUS = 4 + MISC_EVENT;

  /**
   * A component lost the focus.
   */
  public static final int LOST_FOCUS = 5 + MISC_EVENT;

  /**
   * The target component. This indicates the component over which the
   * event occurred or with which the event is associated.
   * This object has been replaced by AWTEvent.getSource()
   *
   * @serial
   * @see java.awt.AWTEvent#getSource()
   */
  public Object target;

  /**
   * The time stamp.
   * Replaced by InputEvent.getWhen().
   *
   * @serial
   * @see java.awt.event.InputEvent#getWhen()
   */
  public long when;

  /**
   * Indicates which type of event the event is, and which
   * other <code>Event</code> variables are relevant for the event.
   * This has been replaced by AWTEvent.getID()
   *
   * @serial
   * @see java.awt.AWTEvent#getID()
   */
  public int id;

  /**
   * The <i>x</i> coordinate of the event.
   * Replaced by MouseEvent.getX()
   *
   * @serial
   * @see java.awt.event.MouseEvent#getX()
   */
  public int x;

  /**
   * The <i>y</i> coordinate of the event.
   * Replaced by MouseEvent.getY()
   *
   * @serial
   * @see java.awt.event.MouseEvent#getY()
   */
  public int y;

  /**
   * The key code of the key that was pressed in a keyboard event.
   * This has been replaced by KeyEvent.getKeyCode()
   *
   * @serial
   * @see java.awt.event.KeyEvent#getKeyCode()
   */
  public int key;

  /**
   * The key character that was pressed in a keyboard event.
   */
//    public char keyChar;

  /**
   * The state of the modifier keys.
   * This is replaced with InputEvent.getModifiers()
   * In java 1.1 MouseEvent and KeyEvent are subclasses
   * of InputEvent.
   *
   * @serial
   * @see java.awt.event.InputEvent#getModifiers()
   */
  public int modifiers;

  /**
   * For <code>MOUSE_DOWN</code> events, this field indicates the
   * number of consecutive clicks. For other events, its value is
   * <code>0</code>.
   * This field has been replaced by MouseEvent.getClickCount().
   *
   * @serial
   * @see java.awt.event.MouseEvent#getClickCount()
   */
  public int clickCount;

  /**
   * An arbitrary argument of the event. The value of this field
   * depends on the type of event.
   * <code>arg</code> has been replaced by event specific property.
   *
   * @serial
   */
  public Object arg;

  /**
   * The next event. This field is set when putting events into a
   * linked list.
   * This has been replaced by EventQueue.
   *
   * @serial
   * @see java.awt.EventQueue
   */
  public Event evt;

  /* table for mapping old Event action keys to KeyEvent virtual keys. */
  private static final int actionKeyCodes[][] = {
    /*    virtual key              action key   */
      {KeyEvent.VK_HOME, Event.HOME},
      {KeyEvent.VK_END, Event.END},
      {KeyEvent.VK_PAGE_UP, Event.PGUP},
      {KeyEvent.VK_PAGE_DOWN, Event.PGDN},
      {KeyEvent.VK_UP, Event.UP},
      {KeyEvent.VK_DOWN, Event.DOWN},
      {KeyEvent.VK_LEFT, Event.LEFT},
      {KeyEvent.VK_RIGHT, Event.RIGHT},
      {KeyEvent.VK_F1, Event.F1},
      {KeyEvent.VK_F2, Event.F2},
      {KeyEvent.VK_F3, Event.F3},
      {KeyEvent.VK_F4, Event.F4},
      {KeyEvent.VK_F5, Event.F5},
      {KeyEvent.VK_F6, Event.F6},
      {KeyEvent.VK_F7, Event.F7},
      {KeyEvent.VK_F8, Event.F8},
      {KeyEvent.VK_F9, Event.F9},
      {KeyEvent.VK_F10, Event.F10},
      {KeyEvent.VK_F11, Event.F11},
      {KeyEvent.VK_F12, Event.F12},
      {KeyEvent.VK_PRINTSCREEN, Event.PRINT_SCREEN},
      {KeyEvent.VK_SCROLL_LOCK, Event.SCROLL_LOCK},
      {KeyEvent.VK_CAPS_LOCK, Event.CAPS_LOCK},
      {KeyEvent.VK_NUM_LOCK, Event.NUM_LOCK},
      {KeyEvent.VK_PAUSE, Event.PAUSE},
      {KeyEvent.VK_INSERT, Event.INSERT}
  };

  /**
   * This field controls whether or not the event is sent back
   * down to the peer once the target has processed it -
   * false means it's sent to the peer, true means it's not.
   *
   * @serial
   * @see #isConsumed()
   */
  private boolean consumed = false;

  /*
   * JDK 1.1 serialVersionUID
   */
  private static final long serialVersionUID = 5488922509400504703L;

  static {
        /* ensure that the necessary native libraries are loaded */
    Toolkit.loadLibraries();
    if (!GraphicsEnvironment.isHeadless()) {
      initIDs();
    }
  }

  /**
   * Initialize JNI field and method IDs for fields that may be
   * accessed from C.
   */
  private static native void initIDs();

  /**
   * <b>NOTE:</b> The <code>Event</code> class is obsolete and is
   * available only for backwards compatibility.  It has been replaced
   * by the <code>AWTEvent</code> class and its subclasses.
   * <p>
   * Creates an instance of <code>Event</code> with the specified target
   * component, time stamp, event type, <i>x</i> and <i>y</i>
   * coordinates, keyboard key, state of the modifier keys, and
   * argument.
   *
   * @param target the target component.
   * @param when the time stamp.
   * @param id the event type.
   * @param x the <i>x</i> coordinate.
   * @param y the <i>y</i> coordinate.
   * @param key the key pressed in a keyboard event.
   * @param modifiers the state of the modifier keys.
   * @param arg the specified argument.
   */
  public Event(Object target, long when, int id, int x, int y, int key,
      int modifiers, Object arg) {
    this.target = target;
    this.when = when;
    this.id = id;
    this.x = x;
    this.y = y;
    this.key = key;
    this.modifiers = modifiers;
    this.arg = arg;
    this.data = 0;
    this.clickCount = 0;
    switch (id) {
      case ACTION_EVENT:
      case WINDOW_DESTROY:
      case WINDOW_ICONIFY:
      case WINDOW_DEICONIFY:
      case WINDOW_MOVED:
      case SCROLL_LINE_UP:
      case SCROLL_LINE_DOWN:
      case SCROLL_PAGE_UP:
      case SCROLL_PAGE_DOWN:
      case SCROLL_ABSOLUTE:
      case SCROLL_BEGIN:
      case SCROLL_END:
      case LIST_SELECT:
      case LIST_DESELECT:
        consumed = true; // these types are not passed back to peer
        break;
      default:
    }
  }

  /**
   * <b>NOTE:</b> The <code>Event</code> class is obsolete and is
   * available only for backwards compatibility.  It has been replaced
   * by the <code>AWTEvent</code> class and its subclasses.
   * <p>
   * Creates an instance of <code>Event</code>, with the specified target
   * component, time stamp, event type, <i>x</i> and <i>y</i>
   * coordinates, keyboard key, state of the modifier keys, and an
   * argument set to <code>null</code>.
   *
   * @param target the target component.
   * @param when the time stamp.
   * @param id the event type.
   * @param x the <i>x</i> coordinate.
   * @param y the <i>y</i> coordinate.
   * @param key the key pressed in a keyboard event.
   * @param modifiers the state of the modifier keys.
   */
  public Event(Object target, long when, int id, int x, int y, int key, int modifiers) {
    this(target, when, id, x, y, key, modifiers, null);
  }

  /**
   * <b>NOTE:</b> The <code>Event</code> class is obsolete and is
   * available only for backwards compatibility.  It has been replaced
   * by the <code>AWTEvent</code> class and its subclasses.
   * <p>
   * Creates an instance of <code>Event</code> with the specified
   * target component, event type, and argument.
   *
   * @param target the target component.
   * @param id the event type.
   * @param arg the specified argument.
   */
  public Event(Object target, int id, Object arg) {
    this(target, 0, id, 0, 0, 0, 0, arg);
  }

  /**
   * <b>NOTE:</b> The <code>Event</code> class is obsolete and is
   * available only for backwards compatibility.  It has been replaced
   * by the <code>AWTEvent</code> class and its subclasses.
   * <p>
   * Translates this event so that its <i>x</i> and <i>y</i>
   * coordinates are increased by <i>dx</i> and <i>dy</i>,
   * respectively.
   * <p>
   * This method translates an event relative to the given component.
   * This involves, at a minimum, translating the coordinates into the
   * local coordinate system of the given component. It may also involve
   * translating a region in the case of an expose event.
   *
   * @param dx the distance to translate the <i>x</i> coordinate.
   * @param dy the distance to translate the <i>y</i> coordinate.
   */
  public void translate(int dx, int dy) {
    this.x += dx;
    this.y += dy;
  }

  /**
   * <b>NOTE:</b> The <code>Event</code> class is obsolete and is
   * available only for backwards compatibility.  It has been replaced
   * by the <code>AWTEvent</code> class and its subclasses.
   * <p>
   * Checks if the Shift key is down.
   *
   * @return <code>true</code> if the key is down; <code>false</code> otherwise.
   * @see java.awt.Event#modifiers
   * @see java.awt.Event#controlDown
   * @see java.awt.Event#metaDown
   */
  public boolean shiftDown() {
    return (modifiers & SHIFT_MASK) != 0;
  }

  /**
   * <b>NOTE:</b> The <code>Event</code> class is obsolete and is
   * available only for backwards compatibility.  It has been replaced
   * by the <code>AWTEvent</code> class and its subclasses.
   * <p>
   * Checks if the Control key is down.
   *
   * @return <code>true</code> if the key is down; <code>false</code> otherwise.
   * @see java.awt.Event#modifiers
   * @see java.awt.Event#shiftDown
   * @see java.awt.Event#metaDown
   */
  public boolean controlDown() {
    return (modifiers & CTRL_MASK) != 0;
  }

  /**
   * <b>NOTE:</b> The <code>Event</code> class is obsolete and is
   * available only for backwards compatibility.  It has been replaced
   * by the <code>AWTEvent</code> class and its subclasses.
   * <p>
   * Checks if the Meta key is down.
   *
   * @return <code>true</code> if the key is down; <code>false</code> otherwise.
   * @see java.awt.Event#modifiers
   * @see java.awt.Event#shiftDown
   * @see java.awt.Event#controlDown
   */
  public boolean metaDown() {
    return (modifiers & META_MASK) != 0;
  }

  /**
   * <b>NOTE:</b> The <code>Event</code> class is obsolete and is
   * available only for backwards compatibility.  It has been replaced
   * by the <code>AWTEvent</code> class and its subclasses.
   */
  void consume() {
    switch (id) {
      case KEY_PRESS:
      case KEY_RELEASE:
      case KEY_ACTION:
      case KEY_ACTION_RELEASE:
        consumed = true;
        break;
      default:
        // event type cannot be consumed
    }
  }

  /**
   * <b>NOTE:</b> The <code>Event</code> class is obsolete and is
   * available only for backwards compatibility.  It has been replaced
   * by the <code>AWTEvent</code> class and its subclasses.
   */
  boolean isConsumed() {
    return consumed;
  }

  /*
   * <b>NOTE:</b> The <code>Event</code> class is obsolete and is
   * available only for backwards compatibility.  It has been replaced
   * by the <code>AWTEvent</code> class and its subclasses.
   * <p>
   * Returns the integer key-code associated with the key in this event,
   * as described in java.awt.Event.
   */
  static int getOldEventKey(KeyEvent e) {
    int keyCode = e.getKeyCode();
    for (int i = 0; i < actionKeyCodes.length; i++) {
      if (actionKeyCodes[i][0] == keyCode) {
        return actionKeyCodes[i][1];
      }
    }
    return (int) e.getKeyChar();
  }

  /*
   * <b>NOTE:</b> The <code>Event</code> class is obsolete and is
   * available only for backwards compatibility.  It has been replaced
   * by the <code>AWTEvent</code> class and its subclasses.
   * <p>
   * Returns a new KeyEvent char which corresponds to the int key
   * of this old event.
   */
  char getKeyEventChar() {
    for (int i = 0; i < actionKeyCodes.length; i++) {
      if (actionKeyCodes[i][1] == key) {
        return KeyEvent.CHAR_UNDEFINED;
      }
    }
    return (char) key;
  }

  /**
   * <b>NOTE:</b> The <code>Event</code> class is obsolete and is
   * available only for backwards compatibility.  It has been replaced
   * by the <code>AWTEvent</code> class and its subclasses.
   * <p>
   * Returns a string representing the state of this <code>Event</code>.
   * This method is intended to be used only for debugging purposes, and the
   * content and format of the returned string may vary between
   * implementations. The returned string may be empty but may not be
   * <code>null</code>.
   *
   * @return the parameter string of this event
   */
  protected String paramString() {
    String str = "id=" + id + ",x=" + x + ",y=" + y;
    if (key != 0) {
      str += ",key=" + key;
    }
    if (shiftDown()) {
      str += ",shift";
    }
    if (controlDown()) {
      str += ",control";
    }
    if (metaDown()) {
      str += ",meta";
    }
    if (target != null) {
      str += ",target=" + target;
    }
    if (arg != null) {
      str += ",arg=" + arg;
    }
    return str;
  }

  /**
   * <b>NOTE:</b> The <code>Event</code> class is obsolete and is
   * available only for backwards compatibility.  It has been replaced
   * by the <code>AWTEvent</code> class and its subclasses.
   * <p>
   * Returns a representation of this event's values as a string.
   *
   * @return a string that represents the event and the values of its member fields.
   * @see java.awt.Event#paramString
   * @since JDK1.1
   */
  public String toString() {
    return getClass().getName() + "[" + paramString() + "]";
  }
}
